<template>
  <el-menu default-active="1-4-1" class="el-menu-vertical-demo" background-color="#545c64" text-color="#ffff" active-text-color="#ffd04b" @open="handleOpen" @close="handleClose" :collapse="isCollapse">
<h3>{{isCollapse?'后台':'后台管理系统'}}</h3>

<!-- 侧边导航无子菜单部分 -->
  <el-menu-item @click="clickMenu(item)"   v-for="item in noChildren" :index="item.path+''" :key="item.path">
<i :class="'el-icon-' + item.icon"></i>
    <span slot="title">{{item.label}}</span>
  </el-menu-item>

<!-- 侧边导航无子菜单部分 -->
  <el-submenu v-for="item in hasChildren" :index="item.path+''" :key="item.path">
    <template slot="title">
 <i :class="'el-icon-' + item.icon"></i>
      <span slot="title">{{item.label}}</span>
    </template>
<!-- 其实实战项目很有用，非常有用，当学习找不到目标具体时，那么实战中就会发现自己需要的到底是什么 -->
    <!-- 侧边导航子子菜单部分 -->
    <el-menu-item-group v-for="(subItem,subIndex) in item.children" :key="subItem.path">
      <el-menu-item @click="clickMenu(subItem)" :index="subIndex+''">{{subItem.label}}</el-menu-item>
        </el-menu-item-group>
  </el-submenu>
</el-menu>
</template>

<script>
export default {
    data() {
      return {
        menu:[]
      };
    },
    methods: {
      handleOpen(key, keyPath) {
        console.log(key, keyPath);
      },
      handleClose(key, keyPath) {
        console.log(key, keyPath);
      },
      clickMenu(item){
        this.$router.push({
            name:item.name
        })
        this.$store.commit('selectMenu',item)
      }
    },
    computed:{
        noChildren(){
            // 逻辑？
            return this.asyncMenu.filter(item =>!item.children)
        },
           hasChildren(){
            // 逻辑？
            return this.asyncMenu.filter(item =>item.children)
        },
        isCollapse(){
          return this.$store.state.tab.isCollapse

        },
        asyncMenu(){
          return this.$store.state.tab.menu
        }
    }
  }
</script>

<style lang="less" scoped>
  .el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 400px;
  }
  .el-menu{
    height: 100%;
    border: none;
    h3{
        color: white;
        text-align: center;
        line-height: 48px;
    }
  }
</style>